A one-step method is introduced for
synthesizing rutile TiO2 nanorods (TNRs) directly from
Ti metal. TNRs are generated
by hydrothermally processing a Ti metal disc in H2SO4/CuSO4 solutions at 150 °C. In a 112-day long
experiment, different ledgewise growth mechanisms are observed in
the early (7-day) and the late (112-day) stages of TNR formation.
A unique phenomenon is observed in that the length of the TNRs is
a function of processing time and the H2SO4/CuSO4 concentration, whereas the diameter of the TNRs is almost
unaffected. It is found that the diameter of these nanorods can only
be affected by variation of temperature. A mechanism involving the
critical dimension of the (101) growth front is proposed in this paper.
In addition, methyl orange degradation efficiency of 90% was achieved
when the fabricated TNRs were used as immobilized photocatalysts.